Table of Contents
DiskIO V3
Introduction
ECB Disk I/O V3 is a board that provides floppy and IDE interfaces.
Specifications
General
- ECB-compatible 8-bit interface.
- Eurocard form factor (160 mm x 100 mm).
- Jumper selectable I/O address area (default 20h - 3Fh). Allows connecting multiple Disk IO controllers per system.
- Jumper selectable RESET input: N8VEM compatible (RESET is 31C) or Kontron compatible (RESET is 26C).
Floppy interface
- Based on SMC FDC9266 floppy disk controller IC. It is fully NEC uPD765 / Intel 8272 compatible and includes an integrated data separator.
- Supports common IBM floppy formats (720 KB, 1.44 MB, and others)
- Polled I/O or interrupt driven I/O. DMA support is not implemented.
- Jumper selectable interrupt output pin: Z80 ~INT, ~NMI, John's Multifunction board, and Wolfgang's ECB-ModPrn board (using Z80 CTC as the interrupt controller).
- 34-pin floppy interface connector. Jumper configurable to either Shugart or PC pin out. Supports 4 floppy drives in Shugart configuration or 2 floppy drives in PC configuration.
- 50-pin Shugart floppy interface (for 8“ floppy drives).
- Optional “disk change” line read out support.
IDE interface
- Based on Intel 8255 PPI, using PPIDE design. This provides compatibility with most IDE disk drives, including ones that were not compatible with previous Disk IO boards.
- Supports two IDE devices (master and slave).
- Polled I/O only.
- Jumper for connecting IDE pin 20 to VCC.
Board
Schematic: ecb_diskio_v3_-_schematics_-_color_1.0.pdf
PCB layout: ecb_diskio_v3_-_board_-_color_1.0.pdf
PCB Gerber files: :boards:ecb:diskio-v3:ecb_diskio_v3_-_kicad_-_1.0.zip
Input/Output Ports
Note: Default I/O area (0x20-0x3F) is used in this section. Adjust according to the actual board settings of I/O address area.
20h-23h (aliases 24h-27h, 28h-2Bh, 2Ch-2Fh) - PPI / PPIDE
- 20h - PPI port A.
- Read/Write IDE data bus, bits 0-7
- Set PPI control word according to the operation (read or write). See control word values below.
- Bit 7 has a pull down register, and it will read as 0 if IDE drive is absent.
- 21h - PPI port B. Read/Write (set PPI control word accordingly)
- Read/Write IDE data bus, bits 8-15
- Set PPI control word according to the operation (read or write). See control word values below.
- 22h - PPI port C, connected to IDE control signals
- Write - Set IDE control signals:
- Bit 0 - IDE A0
- Bit 1 - IDE A1
- Bit 2 - IDE A2
- Bit 3 - IDE /CS0 (inverted) 1 = CS0 active, 0 = CS0 inactive
- Bit 4 - IDE /CS1 (inverted) 1 = CS1 active, 0 = CS1 inactive
- Bit 5 - IDE /WR (inverted) 1 = Write, 0 = inactive
- Bit 6 - IDE /RD (inverted) 1 = Read, 0 = inactive
- Bit 7 - IDE /RESET (inverted) 1 = Reset, 0 = Normal operation
- 23h - PPI control word.
- Write - Set PPI control word. Use following control word values for PPIDE:
- 92h - Read IDE data or command (Ports A and B - mode 0, input; Port C - output)
- 80h - Write IDE data or command (Ports A and B - mode 0, output; Port C - output)
- Read - Read current PPI control word.
30h-3Fh - FDC
- 30h (aliases 32h, 34h, 36h) - FDC Main Status Register (N8VEM Disk I/O uses 36h)
- 31h (aliases 33h, 35h, 37h) - FDC Data Register (N8VEM Disk I/O uses 37h)
- 38h (aliases 39h - 3Fh)
- Write - FDC Diginal Output Register (DOR), also known as latch.
- Bit 0 - TC
- Bit 1 - MOTOR (0 = Motor off, 1 = Motor on)
- Bit 2 - MINI
- Bit 3 - P2
- Bit 4 - P1
- Bit 5 - P0
- Bit 6 - DENSEL (0 = High density, 1 = Low density)
- Bit 7 - ~FDC_RST (0 = FDC RESET active, 1 = normal operation)
- Read - FDC Digital Input Register (DIR)
- Bit 0 - ~DC
- Bits 1-7 - unused
- N8VEM FDC compatibility notes:
- Bit 1 is inverted, so upon system reset floppy drive motor(s) will be turned off
- Bit 6 is inverted, but it is unlikely that it will cause any compatibility problems, as modern 3.5” drives don't use this signal
- Bit 7 of the latch is used differently (and incorrectly) on N8VEM Disk I/O as an input to ~DC (disk change) line. In Zeta SBC this output is connected to FDC RESET input, and allows software controlled FDC reset.
- ~DC (disk change) output from floppy drives can be read from DIR register, bit 0. It could be used by the system to detect floppy disk change. In such case CP/M should be warm rebooted.
Jumpers and Connectors
Jumper JP1 - RESET_SEL
Select reset input pin.
| Jumper Position | Description |
| 1-2* | N8VEM SBC. Reset is connected to ECB pin 31C. |
| 2-3 | Kontron SBC. Reset is connected to ECB pin 26C |
* default
Jumper JP2 - IO_SEL
Select board I/O address area.
| Jumper Position | Description |
| 1-2 | 00h-1Fh |
| 3-4* | 20h-3Fh |
| 5-6 | 40h-5Fh |
| 7-8 | 60h-7Fh |
| 9-10 | 80h-9Fh |
| 11-12 | 0A0h-0BFh |
| 13-14 | 0C0h-0DFh |
| 15-16 | 0E0h-0FFh |
* default
Jumper JP3 - FDC_INT_SEL
Select FDC interrupt output pin.
| Jumper Position | Description |
| no jumper* | FDC doesn't use interrupts (polling I/O mode) |
| 1-2 | Z80 /INT |
| 3-4 | Z80 /NMI |
| 5-6 | /IQ0 - Wolfgang Kabatzke's ECB-ModPrn board |
| 7-8 | /IQ1 - Wolfgang Kabatzke's ECB-ModPrn board |
| 9-10 | /IQ2 - Wolfgang Kabatzke's ECB-ModPrn board |
| 11-12 | /IRQ0 - John Coffman's Multifunction board |
| 13-14 | /IRQ1 - John Coffman's Multifunction board |
| 15-16 | /IRQ2 - John Coffman's Multifunction board |
| 17-18 | /IRQ3 - John Coffman's Multifunction board |
| 19-20 | /IRQ4 - John Coffman's Multifunction board |
| 21-22 | /IRQ5 - John Coffman's Multifunction board |
| 23-24 | /IRQ6 - John Coffman's Multifunction board |
| 25-26 | /IRQ7 - John Coffman's Multifunction board |
* default
Jumper JP4 - READY/DC
Configure floppy /READY or /DC (disk change) signals connection.
| Jumper Position | Description |
| 1-2,3-4* | Connect /DC to DIR; Connect FDC /RDY to GND (floppy drive is always ready) |
| 1-3,2-4 | Connect /DC to GND (DIR always reads as “disk changed”); Connect FDC /RDY to the /READY signal of the floppy drive. Use with drives that provide /READY signal. |
* default
Jumper JP5 - TWO SIDE
Configure /TS (two sides) FDC signal connection.
| Jumper Position | Description |
| 1-2* | Connect /TS to GND (so it is always true) |
| 2-3 | Connect /TS to the floppy drive. Use with 8“ floppy drives that provide “two sides” signal |
* default
Jumper JP6 - DENSEL
Configure /DEN/LCT (sometimes called /DENSEL, /LCT, or “low current”) floppy drive signal connection.
| Jumper Position | Description |
| 1-2* | Connect Floppy drive's /DEN/LCT signal to the DOR (floopy latch) bit 6. |
| 2-3 | Connect Floppy drive's /DEN/LCT signal to FDC. FDC sets this signal for tracks >= 42. Use with 8” floppy drives. |
* default
Jumper JP7 - IBM_FDC
Configure 34-pin floppy drive interface (/MOTOR and /DS* signals) to be IBM PC or Shugart compatible.
| Jumper Position | Description |
| 1-2,3-4* | IBM PC compatible. Pins 10 and 16 are connected to /MOTOR signal. Pin 12 is /DS2. Pin 14 is /DS1. Use with up to two PC floppy drives and a PC floppy cable with a twist. |
| 2-3,4-5 | Shugart 34 compatible. Pin 16 is /MOTOR. Pin 10 is /DS1. Pin 12 is /DS2. Pin 14 is /DS3. Pin 6 is /DS4. |
* default
Jumper JP8 - IDE_VCC
Connect Vcc (+5V) to IDE pin 20.
| Jumper Position | Description |
| installed | P2 pin 20 is connected to the ground. Some flash IDE modules and CF-to-IDE adapters can use pin 20 for power supply. |
| no jumper* | P4 pin 20 is left open |
* default
Bill of Materials (BOM)
BOM Notes
Disclaimer: I did my best to make sure that components listed in this BOM will be compatible with ECB Disk IO V3 board. Obviously I didn't order all of components listed here, and I was not able to actually verify that they will work. Please make sure to double check specifications on manufacturer's and seller's web site before ordering. Please let me know (or update the BOM) if you found any problems or incompatibilities.
Many components have multiple part numbers listed in BOM. There are some differences between various part numbers, such as:
- Different manufacturer (e.g. Texas Instruments vs. National Semiconductor for IC). Usually these ICs will be 100% compatible and won't have any differences in specifications. For some other components (e.g. connectors) different manufacturer also means different quality. It for example is likely to get a better quality connector from TE (was AMP/Tyco) than from some obscure manufacturer (e.g. components sold under Jameco ValuePro brand).
- Specification differences
- Different IC families (LS, ALS), different technologies (TTL and CMOS). They have different specs, and you might prefer to use certain IC family.
- Different IC speed/frequency, especially PPI.
- Minor differences. For example: RoHS or Pb-free vs. regular components; thickness of gold plating on connectors; frequency stability of oscillators and crystals.
- Price differences
If unsure what to order, read specifications on seller's and manufacturer's web sites. Also please read Replacement Notes below. Finally, consult people on RetroBrew Computers Forum.
BOM
| Component type | Reference | Description | Quantity | Possible sources and notes |
| PCB | ECB Disk IO PCB Version 3.0 | 1 | Refer to board inventory page. | |
| Capacitor | C1 - C16 | 0.1 uF ceramic, 5.08 mm lead spacing | 16 | |
| Capacitor | C1 - C16 | 0.1 uF ceramic, 5.08 mm lead spacing | 16 | Mouser 80-C323C104K5R Jameco 25523 |
| Capacitor | C17,18 | 22 uF, 50 V electrolytic | 2 | |
| Diode | D1 | 5 mm LED indicator | 1 | |
| Connector | JP1, JP5, JP6 | 3×1 pin header | 3 | Jameco 109576 Mouser 649-69190-103HLF, 649-78229-103HLF |
| Connector | JP2 | 8×2 pin header | 1 | Note: This connector is optional. Solder a wire between pins 3 and 4 for default I/O address area (020h-03Fh). |
| Connector | JP3 | 13×2 pin header | 1 | Jameco 53495 Mouser 649-68602-126HLF, 649-77313-824-26LF Note: This connector is optional. Only required if you wish to use interrupt-driven I/O. |
| Connector | JP4 | 2×2 pin header | 1 | |
| Connector | JP7 | 5×1 pin header | 1 | |
| Connector | JP8, P5 | 2×1 pin header | 2 | Jameco 108338 Mouser 649-78229-102HLF |
| Connector | P1 | DIN 41612 - right angle | 1 | Mouser 617-09-03-396-6921 Jameco 859561, 859430 |
| Connector | P2 | 20×2 pin header shrouded | 1 | Mouser 737-BHR-40-VUA |
| Connector | P3 | 17×2 pin header shrouded | 1 | Jameco 68583, 753547 Mouser 737-BHR-34-VUA |
| Connector | P4 | 25×2 pin header shrouded | 1 | Mouser 737-BHR-50-VUA Note: This connector is optional. Only required for 50-pin Shugart interface, which is normally used by 8“ floppy drives. |
| Resistor | R1 - R4 | 10 kOhm, 1/4 W | 4 | Jameco 691104 Mouser 291-10K-RC |
| Resistor | R5, R6 | 470 Ohm, 1/4 W | Jameco 690785 Mouser 291-470-RC |
|
| Resistor | R7 | 0 Ohm, or a wire | 1 | Note: Solder wire instead of this resistor. |
| Resistor Array | RR1 | 1 kOhm, 9 pin, bussed resistor array | 1 | Note 1: Use 150 Ohm or 330 Ohm resistor array for older drives that have 150 Ohm or 300 Ohm terminators. Note 2: Only 6 first resistors are used, so 7 pin or (more common) 8 pin arrays can be used instead. Make sure to align pin 1 properly. Also it is possible to use 10 pin arrays, with 10th pin cut just by the package body. |
| IC | U1 | FDC9266 FDC | 1 | Order from Sergey; Utsource; eBay |
| IC | U2 | 8255 PPI | 1 | Jameco 52417 Unicorn Electronics (order 82C55) Utsource; eBay; Ask Sergey |
| IC | U3 | 74LS273 | 1 | Mouser 595-SN74ALS273N, 512-DM74ALS273N, 595-SN74LS273N, 595-SN74AHCT273N Unicorn Electronics Jameco 47386, 308398, 45049 |
| IC | U4 | 74LS245 | 1 | Mouser 595-SN74ALS245A-1N, 595-SN74ALS245AN, 595-SN74AHCT245N; Jameco 47212 |
| IC | U5, U6 | 74LS241 | 2 | Mouser 595-SN74LS241N, 595-CD74HCT241EE4, 595-CD74HCT241 Jameco 47167 |
| IC | U7 | 74LS240 | 1 | Mouser 595-SN74ALS240AN, 595-SN74LS240N, 595-SN74AHCT240N Unicorn Electronics Jameco 47141, 308291, 45014 |
| IC | U8 | 74LS139 | 1 | Mouser 595-SN74ALS139N, 595-SN74LS139AN, 595-CD74ACT139E, 512-74ACT139PC, 595-SN74AHCT139N; Unicorn Electronics; Jameco 46623, 301268, 63773, 239011 |
| IC | U9 | 74LS138 | 1 | Mouser 595-SN74ALS138AN, 512-DM74ALS138N, 595-SN74LS138N, 595-SN74AHCT138N Unicorn Electronics Jameco 46607, 46608, 301233, 44927 |
| IC | U10 | 74LS125 | 1 | Mouser 595-SN74LS125AN, 595-SN74AHCT125N Unicorn Electronics Jameco 46501 Note: This IC is optional. It is only used for “Disk Change” signal readout, which is not supported by the current firmware. |
| IC | U11 | 74LS32 | 1 | Mouser 595-SN74ALS32N, 512-DM74ALS32N, 595-SN74LS32N, 595-SN74AHCT32N; Unicorn Electronics; Jameco 44134, 47466, 47467, 295515 |
| IC | U12,U13 | 74LS14 | 2 | Mouser 595-SN74LS14N, 595-SN74AHCT14N; Unicorn Electronics; Jameco 46640, 295460, 44935 |
| IC | U14,U15 | 74LS06 | 2 | Mouser 595-SN74LS06N; Unicorn Electronics; Jameco 46359 Note: U15 is optional, and only required for 8” drives. |
| IC | U16 | 8 MHz oscillator, full can | 1 | Mouser 815-ACO-8-EK, 520-TCF800-X Jameco 27991 |
| IC Socket | U1, U4 - U6 | 40 pin 600 mil DIP socket | 2 | Jameco 41111 Mouser 649-DILB40P223TLF, 517-4840-6000-CP |
| IC Socket | U7, U8 | 20 pin 300 mil DIP socket | 2 | Jameco 112248 Mouser 649-DILB20P-223TLF, 517-4820-3000-CP |
| IC Socket | U9 - U13, U24 | 16 pin 300 mil DIP socket | 6 | Jameco 37373 Mouser 649-DILB16P-223TLF, 517-4816-3000-CP |
| IC Socket | U14 - U20 | 14 pin 300 mil DIP socket | 6 | Jameco 37162 Mouser 649-DILB14P-223TLF, 517-4814-3000-CP |
| Oscillator Socket | U21 - U23 | 4 pin 300 mil DIP full can oscillator socket | 1 | Jameco 133006 Mouser 535-1107741 |
—
| Component type | Reference | Description | Quantity | Possible sources and notes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Capacitor | C1 - C16 | 0.1 uF ceramic, 5.08 mm lead spacing | 16 | Mouser [[http://www.mouser.com/ProductDetail/Kemet/C323C104K5R5TA/?qs=sGAEpiMZZMuAYrNc52CMZJc2YQhHPlYVWR1uyzMGvKQ=|80-C323C104K5R]] Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_25523_-1|25523]] | | Capacitor | C17,18 | 22 uF, 50 V electrolytic | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Diode | D1 | 5 mm LED indicator | 1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | JP1, JP5, JP6 | 3×1 pin header | 3| \\ Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_109576_-1|109576]]; Mouser [[http://www.mouser.com/ProductDetail/FCI/69190-103HLF/?qs=sGAEpiMZZMvlX3nhDDO4AIYfP1TbgJhjYISz3bCP/wo=|649-69190-103HLF]], [[http://www.mouser.com/ProductDetail/FCI/78229-103HLF/?qs=sGAEpiMZZMtsLRyDR9nM14Vjyw4ze+jtWzL/ZN0BySE=|649-78229-103HLF]]| | Connector | JP2 | 8×2 pin header | 1 | Note: This connector is optional. Solder a wire between pins 3 and 4 for default I/O address area (020h-03Fh). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | JP3 | 13×2 pin header | 1 | \\ Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_53495_-1|53495]]; Mouser [[http://www.mouser.com/ProductDetail/FCI/68602-126HLF/?qs=sGAEpiMZZMtsLRyDR9nM1+mbmmVUI0dAYWKlImNZbew=|649-68602-126HLF]], [[http://www.mouser.com/ProductDetail/FCI/77313-824-26LF/?qs=sGAEpiMZZMtsLRyDR9nM14Vjyw4ze+jtilYVPfgiHws=|649-77313-824-26LF]] \\ \\ Note: This connector is optional. Only required if you wish to use interrupt-driven I/O. | | Connector | JP4 | 2×2 pin header | 1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | JP7 | 5×1 pin header | 1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | JP8, P5 | 2×1 pin header | 2 | Jameco 108338; Mouser 649-78229-102HLF | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | P1 | DIN 41612 right angle|1|Mouser [[http://www.mouser.com/Search/ProductDetail.aspx?qs=gIpPgrDBK/iSDuMebe5eaQ==|617-09-03-396-6921]]; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_859561_-1|859561]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_859430_-1|859430]]| | Connector | P2 | 20×2 pin header shrouded | 1 | Mouser 737-BHR-40-VUA | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | P3 | 17×2 pin header shrouded | 1 | Jameco 68583, 753547; Mouser 737-BHR-34-VUA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Connector | P4 | 25×2 pin header shrouded | 1 | Mouser [[https://www.mouser.com/Search/ProductDetail.aspx?R=BHR-50-VUAvirtualkey64610000virtualkey737-BHR-50-VUA|737-BHR-50-VUA]] \\ \\ Note: This connector is optional. Only required for 50-pin Shugart interface, which is normally used by 8" floppy drives. | | Resistor | R1 - R4 | 10 kOhm, 1/4 W | 4 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_691104_-1|691104]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/Xicon/291-10K-RC/?qs=sGAEpiMZZMu61qfTUdNhG6xwTrVwTvbz8PPav3aExs8=|291-10K-RC]] | | Resistor | R5, R6 | 470 Ohm, 1/4 W | 2 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_690785_-1|690785]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/Xicon/291-470-RC/?qs=sGAEpiMZZMu61qfTUdNhG1AdbDi3ermZfsjMZ8nKiDY=|291-470-RC]] | | Resistor | R7 | 0 Ohm, or a wire | 1 | Note: Solder wire instead of this resistor. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Resistor Array | RR1 | 1 kOhm, 9 pin, bussed resistor array | 1 | Note 1: Use 150 Ohm or 330 Ohm resistor array for older drives that have 150 Ohm or 300 Ohm terminators. \\ \\ Note 2: Only 6 first resistors are used, so 7 pin or (more common) 8 pin arrays can be used instead. Make sure to align pin 1 properly. Also it is possible to use 10 pin arrays, with 10th pin cut just by the package body. | | IC | U1 | FDC9266 FDC | 1 | Order from Sergey; Utsource; eBay | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| IC | U2 | 8255 PPI | 1 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_52417_-1|52417]] \\ \\ Unicorn Electronics (order 82C55); Utsource; eBay; Ask Sergey | | IC | U3 | 74LS273 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS273N/?qs=sGAEpiMZZMvxP+vr8KwMwLcnqnc7ytuCSdm8rhHZ20Q=|595-SN74ALS273N]], [[http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/DM74ALS273N/?qs=sGAEpiMZZMvxP+vr8KwMwC7zurHDHx7mG1kHgpYvQYs=|512-DM74ALS273N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS273N/?qs=sGAEpiMZZMvxP+vr8KwMwE/H01ykG3Ig8PvmfhhDmpo=|595-SN74LS273N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT273N/?qs=sGAEpiMZZMvxP+vr8KwMwLcnqnc7ytuC4LhHLUd1T3c=|595-SN74AHCT273N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_47386_-1|47386]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_308398_-1|308398]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_45049_-1|45049]] | | IC | U4 | 74LS245 | 1 | Mouser 595-SN74ALS245A-1N, 595-SN74ALS245AN, 595-SN74AHCT245N; Jameco 47212 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| IC | U5, U6 | 74LS241 | 2 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS241N/?qs=sGAEpiMZZMutXGli8Ay4kBPZX2vby+OkFPcUL50faVY=|595-SN74LS241N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/CD74HCT241EE4/?qs=sGAEpiMZZMuiiWkaIwCK2ZiNMAcS1yForxl+VkHQ7Cg=|595-CD74HCT241EE4]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/CD74HCT241E/?qs=sGAEpiMZZMuiiWkaIwCK2ZiNMAcS1yFoBzIOoiJl9Fg=|595-CD74HCT241]]; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_47167_-1|47167]] | | IC | U7 | 74LS240 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS240AN/?qs=sGAEpiMZZMuiiWkaIwCK2bK/UlbxrrJCstrLRa7dF2I=|595-SN74ALS240AN]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS240N/?qs=sGAEpiMZZMuiiWkaIwCK2UHhUsuHvyUOLkmAhnV0bVo=|595-SN74LS240N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT240N/?qs=sGAEpiMZZMuiiWkaIwCK2bK/UlbxrrJCjatBJKq2nRs=|595-SN74AHCT240N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_47141_-1|47141]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_308291_-1|308291]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_45014_-1|45014]] | | IC | U8 | 74LS139 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS139N/?qs=sGAEpiMZZMtxONTBFIcRfq4mebfZO+ELhxGgXnQWC8c=|595-SN74ALS139N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS139AN/?qs=sGAEpiMZZMtxONTBFIcRfpKvrGTByBdi/BZhV6RAyCA=|595-SN74LS139AN]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/CD74ACT139E/?qs=sGAEpiMZZMtxONTBFIcRfsQCBiNmETR9yYy7yqk6Oio=|595-CD74ACT139E]], [[http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/74ACT139PC/?qs=sGAEpiMZZMtxONTBFIcRfil/stwym1XXVoaftb8reqY=|512-74ACT139PC]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT139N/?qs=sGAEpiMZZMtxONTBFIcRfsQCBiNmETR9s6YW4lCucrQ=|595-SN74AHCT139N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46623_-1|46623]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_301268_-1|301268]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_63773_-1|63773]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_239011_-1|239011]] | | IC | U9 | 74LS138 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS138AN/?qs=sGAEpiMZZMtxONTBFIcRfgMIbQHDmxevHm7M5LBU91I=|595-SN74ALS138AN]], [[http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/DM74ALS138N/?qs=sGAEpiMZZMtxONTBFIcRfmXc22tCNV5puFUyD3ssFWc=|512-DM74ALS138N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS138N/?qs=sGAEpiMZZMtxONTBFIcRfpKvrGTByBdiQjlbb3Ynr4s=|595-SN74LS138N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT138N/?qs=sGAEpiMZZMtxONTBFIcRfsQCBiNmETR9UG1XXuubiis=|595-SN74AHCT138N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46607_-1|46607]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46608_-1|46608]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_301233_-1|301233]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_44927_-1|44927]] | | IC | U10 | 74LS125 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS125AN/?qs=sGAEpiMZZMuiiWkaIwCK2WAncryyStC7ZVuQLUtSxbI=|595-SN74LS125AN]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT125N/?qs=sGAEpiMZZMuiiWkaIwCK2YBcf8bvyFlOxbSCg1DZEdI=|595-SN74AHCT125N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46501_-1|46501]] \\ \\ Note: This IC is optional. It is only used for "Disk Change" signal readout, which is not supported by the current firmware. | | IC | U11 | 74LS32 | 1 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS32N/?qs=sGAEpiMZZMtMa9lbYwD6ZFfNaxHsgUwaIDUbKItpOSQ=|595-SN74ALS32N]], [[http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/DM74ALS32N/?qs=sGAEpiMZZMtMa9lbYwD6ZE1jns5lgn1Bh06DPj26jcM=|512-DM74ALS32N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS32N/?qs=sGAEpiMZZMtMa9lbYwD6ZOuZLcSXNpUacHuLMioAEnk=|595-SN74LS32N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT32N/?qs=sGAEpiMZZMtMa9lbYwD6ZAv0bRAq9ZjLc7SArqaJcaQ=|595-SN74AHCT32N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_44134_-1|44134]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_47466_-1|47466]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_47467_-1|47467]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_295515_-1|295515]] | | IC | U12,U13 | 74LS14 | 2 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS14N/?qs=sGAEpiMZZMuyBeSSR239Ias+1yN/IiBNAdJP0U6/u9k=|595-SN74LS14N]], [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74AHCT14N/?qs=sGAEpiMZZMuyBeSSR239Ias+1yN/IiBNVP9ThiduLa4=|595-SN74AHCT14N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46640_-1|46640]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_295460_-1|295460]], [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_44935_-1|44935]] | | IC | U14,U15 | 74LS06 | 2 | Mouser [[http://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS06N/?qs=sGAEpiMZZMuiiWkaIwCK2VXqsqoZKDeCkeD2aBHhlIw=|595-SN74LS06N]]; Unicorn Electronics; Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46359_-1|46359]] \\ \\ Note: U15 is optional, and only required for 8" drives. | | IC | U16 | 8 MHz oscillator, full can | 1 | Mouser [[http://www.mouser.com/ProductDetail/ABRACON/ACO-8000MHZ-EK/?qs=sGAEpiMZZMt8zWNA7msRCufK6FojpZgBol2LWy2yIwI=|815-ACO-8-EK]], [[http://www.mouser.com/ProductDetail/ECS/ECS-100AX-80/?qs=sGAEpiMZZMt8zWNA7msRCkZF6o3VgKlSdZ7QUqFOCa0=|520-TCF800-X]] \\ \\ Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_27991_-1|27991]] | | IC Socket | U1, U4 - U6 | 40 pin 600 mil DIP socket | 2 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_41111_-1|41111]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/FCI/DILB40P-223TLF/?qs=sGAEpiMZZMs/Sh/kjph1tnWBa37eU7kEvItX7WAak1Y=|649-DILB40P223TLF]], [[http://www.mouser.com/ProductDetail/3M-Electronic-Solutions-Division/4840-6000-CP/?qs=sGAEpiMZZMs/Sh/kjph1tvt1/mEPT/Xo7HrzikVwIY8=|517-4840-6000-CP]] | | IC Socket | U7, U8 | 20 pin 300 mil DIP socket | 5 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_112248_-1|112248]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/FCI/DILB20P-223TLF/?qs=sGAEpiMZZMs/Sh/kjph1tqkewsuxcQXGl93XoFG0NGQ=|649-DILB20P-223TLF]], [[http://www.mouser.com/ProductDetail/3M-Electronic-Solutions-Division/4820-3000-CP/?qs=sGAEpiMZZMs/Sh/kjph1tvt1/mEPT/XoGLwqMMa088g=|517-4820-3000-CP]] | | IC Socket | U9 - U13, U24 | 16 pin 300 mil DIP socket | 2 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_37373_-1|37373]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/FCI/DILB16P-223TLF/?qs=sGAEpiMZZMs/Sh/kjph1tnWBa37eU7kEZ8uy8DVlop0=|649-DILB16P-223TLF]], [[http://www.mouser.com/ProductDetail/3M-Electronic-Solutions-Division/4816-3000-CP/?qs=sGAEpiMZZMs/Sh/kjph1tvt1/mEPT/Xo2MaLGaLrmns=|517-4816-3000-CP]] | | IC Socket | U14 - U20 | 14 pin 300 mil DIP socket | 6 | Jameco [[http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_37162_-1|37162]] \\ \\ Mouser [[http://www.mouser.com/ProductDetail/FCI/DILB14P-223TLF/?qs=sGAEpiMZZMs/Sh/kjph1tvt1/mEPT/XoudDvhlAH3XM=|649-DILB14P-223TLF]], [[http://www.mouser.com/ProductDetail/3M-Electronic-Solutions-Division/4814-3000-CP/?qs=sGAEpiMZZMs/Sh/kjph1tvt1/mEPT/Xolv7TyDO1KrY=|517-4814-3000-CP]] | | Oscillator Socket | U21 - U23 | 4 pin 300 mil DIP full can oscillator socket | 1 |
Replacement Notes
- 74xx logic
- TTL logic families: 74LS, 74ALS, 74F, or TTL-compatible CMOS: 74HCT and 74AHCT could be used. Note some people reported problems when using CMOS ICs in their ECB boards for bus drivers and transmitters (74×241, 74×245). 74ACT-series have very steep (fast) switching slopes, that might cause more noise (signal reflection or ringing) on unterminated buses.
- Plain 74LS should work with CPU frequency up to 8 MHz. But it is recommended to use higher speed and lower power 74ALS ICs.
- 8255 PPI
- It is recommended to use higher speed CMOS versions. For example 8 MHz Intersil / Harris CP82C55A part (note CP82C55A-5 is 5 MHz), 10 MHz Toshiba TMP82C55AP-10 or NEC D71055C-10 parts.
Software configuration
SBC V2
The default build of RomWBW for the SBC V2 will not recognize the Disk IO V3. A custom build is required. Follow the instructions here to build and customize the ROM and make the following changes :
Floppy Disk support:
FDENABLE .SET TRUE ; TRUE FOR FLOPPY DEVICE SUPPORT FDMODE .SET FDMODE_DIO3 ; FDMODE_DIO, FDMODE_DIDE, FDMODE_DIO3
Use the FDU.COM utility in CP/M to test and format floppy disks.
IDE Support:
The DISK IO V3 board implements the IDE interface via PPIDE. PPIDE is supported in ROMWBW but is not enabled by default. Up to three IDE interfaces can be used and when enabled ROMWBW will look for them on port 60h, 20h and 44h respectively.
To enable IDE support and set the number of interfaces available, update your custom configuration:
SBC_std_cust.asm
PPIDEENABLE .SET TRUE ; TRUE FOR PPIDE DEVICE SUPPORT PPIDECNT .SET 1 ; NUMBER OF 8255 CHIPS. EACH WILL SUPPORT TWO DRIVES
Further customization of ports and IDE modes done by adding and changing these definitions in your customer configuration file.
PPIDE0BASE .SET $60 ; PPIDE 0: PPI REGISTERS BASE ADR PPIDE0A8BIT .SET FALSE ; PPIDE 0A (MASTER): 8 BIT XFER PPIDE0B8BIT .SET FALSE ; PPIDE 0B (SLAVE): 8 BIT XFER PPIDE1BASE .SET $20 ; PPIDE 1: PPI REGISTERS BASE ADR PPIDE1A8BIT .SET FALSE ; PPIDE 1A (MASTER): 8 BIT XFER PPIDE1B8BIT .SET FALSE ; PPIDE 0B (SLAVE): 8 BIT XFER PPIDE2BASE .SET $44 ; PPIDE 2: PPI REGISTERS BASE ADR PPIDE2A8BIT .SET FALSE ; PPIDE 2A (MASTER): 8 BIT XFER PPIDE2B8BIT .SET FALSE ; PPIDE 0B (SLAVE): 8 BIT XFER
Make sure that IDEENABLE is set back to false unless you have another device with has a true IDE interface:
IDEENABLE .SET FALSE ; TRUE FOR IDE DEVICE SUPPORT
Use the FDISK80.COM utility in CP/M to setup your IDE drive.
Example process for preparing an SD CARD to work in the DISKIO V3 or other PPIDE devices:
- A partition is not used for setting up a CP/M disks.
- Each disk is called a slice and can be a maximum of 8Mb.
- Space is reserved at the beginning of the card for up to 8 slices (disks)
- Slices are not visible on windows/linux
- Execute FDISK80, specifying the disk unit to be modified. Disk unit information is displayed at boot time.
- I – command: wipe the old partition table.
- R - Reserve 8 slices (disks)
- G - Set geometry for SDCard, C:H:S – sectors per head (track) = 16, C:H:S – tracks (heads) per cylinder = 16
- N - New partition: number = 1, start cyclinder = default (520), Ending Cylinder = 8193
- T - Partition number = 1, Type = 06
- W - Write partition information to SDCard
- Format partition 1 in a windows/linux machine, or expand it or add new partitions.
- Format slices (disks) using CLRDIR.COM
File List
| Filename | Filesize | Last modified |
|---|---|---|
| disk_io_v3_-_complete_board.jpg | 270.3 KiB | 2015/11/01 18:49 |
| disk_io_v3_-_component_side.jpg | 296.7 KiB | 2015/11/01 18:49 |
| disk_io_v3_-_solder_side.jpg | 236.3 KiB | 2015/11/01 18:49 |
| ecb_diskio_v3_-_board_-_color_1.0.pdf | 1.1 MiB | 2015/11/01 18:49 |
| ecb_diskio_v3_-_gerber_-_1.0.zip | 279.8 KiB | 2015/11/01 18:49 |
| ecb_diskio_v3_-_kicad_-_1.0.zip | 216.2 KiB | 2015/11/01 18:49 |
| ecb_diskio_v3_-_schematics_-_color_1.0.pdf | 265.9 KiB | 2015/11/01 18:49 |
| max_working_hard.jpg | 149.3 KiB | 2015/11/01 18:49 |
| reservedarea.png | 6.0 KiB | 2019/04/23 11:22 |
